back M 101

Object: M 101 Galaxy
Imager: Dipl.-Ing. Johannes Huwe
Date & Location: 6. april 2003, NMSkies
Optics / Telescope: Celestron C14 SCT, SBIG ST1001E
Focal length f/ratio: 3910 mm @ f10 (no guiding)
Exposure: 48 min total, LRGB
L = 12 (3x4) min, binning 2x2
R = 12 (3x4) min, binning 2x2
G = 12 (3x4) min, binning 2x2
B = 12 (3x4) min, binning 2x2
Software: Camera control and image reduction with CCDSoft, RGB Combine in MaxIm DL, processed with Photoshop
Conditions: Extrem windy (8-25 mph).
Object Info: The distance of M101 is about 24 million light years and it has a linear diameter of over 170.000 light years. Apparent Dimension 22.0 arc min.